Create Quarkus project ("test1") -> add some println in "test1/src/main/java/org/acme/ExampleResource.java" -> put breakpoint to first println (see screenshot_2) -> Debug as -> Quarkus Application -> open localhost:8080/hello -> see screenshot_1 -> Switch -> Step over -> works fine -> Create one more Quarkus project ("test2") -> Add some another println in "test2/src/main/java/org/acme/ExampleResource.java" -> put breakpoint to first println -> Debug as -> Quarkus Application -> open localhost:8080/hello -> see screenshot_1 -> Switch -> opens editor with test1/ExampleResource.java -> Step over -> printed text from test2/ExampleResource.java. Println example screenshot_2